Salts of aromatic hydroxyl amins



t of New York, State of ventedeertain new and 1e suchas will to gam acids as or at rear, n. r.

mars or rinorrarro e natures.

Ho Drawing,

Toall whom it may concern:

Be it known that a citizenot the United States, residing at useful lm in Salts of Aromatic Hydroxyl :u: t 5 and l dohereby declare the following to be a full, clear, and exact description of the invention, enable others skilled in the art appertains to make and use the to which it same. y

' This invention relates to the new and useiiul products obtained as the result of the interaction of an aromatic hydrox l-amin with cu organic acid. More partic arly the invention relates to the salt obtained when an aromatic hydroxyl-alnin is treated with oxalic acid. H, tor instance, phenyl-hydroxylamin is treated with oxalic acid, an oxalate is obtained which is of particular utility in a photographic developer. The new products, according to this invention, however, are not limited to oxalates or to the phenyl-hydroxylamin oxalate; in its broader aspect the mvention includes salts of the homologues of phenyl-hydroxyl-amin, or of other aromatic hydroxyl-amins, such as naphthyl-hydroxylamin, etc.

l have found. that when a relatively concentrated solution of henyl-hydroxylamin in water is treated wit a solution of oxalic 'acid (say, about 10%) there is produced almost instantly a crystalline preciitate which is of a stable character, and tch'is also not very soluble in water. Under proper conditions a relatively pure be obtained. merely by filter a: and washing, but a less ure product, when obtained, can of course e further purified by recrystallization. The resulting product ll consider to be the oxalate ('3; e.", a salt of an organic acid) of the phenyl-hydroxylin. lit is stable in the air and can be kept for long periods of time.

The solution of phenyl hydroxyl-amin may be -produced in any suitable manner. The solutions may, for example, be used in which the hydroxyl-amin is itself directlyproduced, in the first instance, and without preliminary isolation thereof. lnstead of combining the phenyl-hydroxyl-a with oxalic acid, it can be combined with other organic acids, but ll consider that such oroxalic which precipitate the Specification oi Letters Patent. a licants one season is,

precipitate can Patented sat. a, rest. rare. serial no. aerate.

solutions areof particular value. In so far. as I am aware not only the oxalate of but also salts with ot themselves novel products, and Taccordingly claim these new products.

The'phenyl-hydroxyl-amin oxalate, is of particular utility in photography as a developer. The developing solution is by dissolving-in the order of water the following hydroxyl-aininfrom its given in 100 ozs.

Sodium suliite (dry) 5%; ounces Hydro quinone 1 Phenyl-hydroxy -amin oxalate- -Sodium carbonate (anhydrous 1O Potassium broniid (crystallinei- 6 grains In using this solution it can be diluted with water to the desired extent and the paper to be developed then treated therewith in a manner such as is customary in the employment of developing solutions.

For developing films I have found the following iormula of advantage:

Water 10 ounces Sodium sulfite (dry) 20 grains ydro quinone 40 Phenyl hydroxyl amin oxalate (as above described) 2O Sodium carbonate (anhydrous) 600 otassium bromid (crystalline)- l In using this developer it can be diluted with water to the desired extent, and then used for developing films in much the usual manner, but with added advantage to the developing process and to the result pro- 'duced.

ll do not claim herein the photographic developers which are herein described, but these form the subject of a divisional application,

'Serial No. 491,296 filed August 10, 1921.

The solid salts obtained by the interaction of the aromatic hydroxyl-amins and the organic acids are-relatively stable. They can be kept for considerable periods of time and may be, used in a dry state. Where they are used in a photographic developer they can be combined with other dry ingredients of the developer and the composite developer then added to water or to other solutions for use. The developer may thus be put up in tablet form, etc.

' be understood that It should, of course, the invention covers the salts of the aromatic ghenyl-hydroxyl-amin,

er organic acid are in prepared hydroxyl-amins per se in solid or dissolved ing from the combinationof oxalic acid and 10 form, and whether used alone or combined an aromatic hydroxyl-amm.

with other solid or. liquid ingredients. 4. As a new product, the compound result- I claim: in from the reaction of a solution of oxalic 5 1. As a new product, a salt of an aromatic acld with a solution of phenyl-hydroxylhydroxyl-amin with an organic acid. 'amin, the same being in its dry state a stable 15 2. As a new product, a salt of phenyl-hycrystalline product. drox'yl-amin with an organic acid. In testimon whereof Iafiix m si ature.

ATHAN' SULZB R ER.

3. As a new product, the compound result- 

